diff --git a/packages/next/build/entries.ts b/packages/next/build/entries.ts
index 946fa76986781..7181d6f8c9718 100644
--- a/packages/next/build/entries.ts
+++ b/packages/next/build/entries.ts
@@ -15,11 +15,11 @@ import { EDGE_RUNTIME_WEBPACK } from '../shared/lib/constants'
 import { MIDDLEWARE_ROUTE } from '../lib/constants'
 import { __ApiPreviewProps } from '../server/api-utils'
 import { isTargetLikeServerless } from '../server/utils'
-import { normalizePagePath } from '../server/page-path-utils'
-import { normalizePathSep } from '../server/page-path-utils'
 import { warn } from './output/log'
 import { parse } from '../build/swc'
 import { isFlightPage, withoutRSCExtensions } from './utils'
+import { normalizePathSep } from '../shared/lib/page-path/normalize-path-sep'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 
 type ObjectValue<T> = T extends { [key: string]: infer V } ? V : never
 
diff --git a/packages/next/build/index.ts b/packages/next/build/index.ts
index d2a6a04954c39..e096a315d1906 100644
--- a/packages/next/build/index.ts
+++ b/packages/next/build/index.ts
@@ -63,7 +63,7 @@ import { __ApiPreviewProps } from '../server/api-utils'
 import loadConfig from '../server/config'
 import { isTargetLikeServerless } from '../server/utils'
 import { BuildManifest } from '../server/get-page-files'
-import { normalizePagePath } from '../server/page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 import { getPagePath } from '../server/require'
 import * as ciEnvironment from '../telemetry/ci-info'
 import {
diff --git a/packages/next/build/utils.ts b/packages/next/build/utils.ts
index cd71a50301d47..74e29050550be 100644
--- a/packages/next/build/utils.ts
+++ b/packages/next/build/utils.ts
@@ -26,10 +26,6 @@ import { isDynamicRoute } from '../shared/lib/router/utils/is-dynamic'
 import escapePathDelimiters from '../shared/lib/router/utils/escape-path-delimiters'
 import { findPageFile } from '../server/lib/find-page-file'
 import { GetStaticPaths, PageConfig } from 'next/types'
-import {
-  denormalizePagePath,
-  normalizePagePath,
-} from '../server/page-path-utils'
 import { BuildManifest } from '../server/get-page-files'
 import { removePathTrailingSlash } from '../client/normalize-trailing-slash'
 import { UnwrapPromise } from '../lib/coalesced-function'
@@ -42,6 +38,8 @@ import isError from '../lib/is-error'
 import { recursiveDelete } from '../lib/recursive-delete'
 import { Sema } from 'next/dist/compiled/async-sema'
 import { MiddlewareManifest } from './webpack/plugins/middleware-plugin'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 
 const { builtinModules } = require('module')
 const RESERVED_PAGE = /^\/(_app|_error|_document|api(\/|$))/
diff --git a/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts b/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
index 7041477bd200e..806299a229f48 100644
--- a/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
+++ b/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
@@ -6,7 +6,7 @@ import { getUtils, vercelHeader, ServerlessHandlerCtx } from './utils'
 
 import { renderToHTML } from '../../../../server/render'
 import { tryGetPreviewData } from '../../../../server/api-utils/node'
-import { denormalizePagePath } from '../../../../server/page-path-utils'
+import { denormalizePagePath } from '../../../../shared/lib/page-path/denormalize-page-path'
 import { setLazyProp, getCookieParser } from '../../../../server/api-utils'
 import { getRedirectStatus } from '../../../../lib/load-custom-routes'
 import getRouteNoAssetPath from '../../../../shared/lib/router/utils/get-route-from-asset-path'
diff --git a/packages/next/build/webpack/loaders/next-serverless-loader/utils.ts b/packages/next/build/webpack/loaders/next-serverless-loader/utils.ts
index e28741a073826..3aedda04071b1 100644
--- a/packages/next/build/webpack/loaders/next-serverless-loader/utils.ts
+++ b/packages/next/build/webpack/loaders/next-serverless-loader/utils.ts
@@ -23,7 +23,7 @@ import { __ApiPreviewProps } from '../../../../server/api-utils'
 import { acceptLanguage } from '../../../../server/accept-header'
 import { detectLocaleCookie } from '../../../../shared/lib/i18n/detect-locale-cookie'
 import { detectDomainLocale } from '../../../../shared/lib/i18n/detect-domain-locale'
-import { denormalizePagePath } from '../../../../server/page-path-utils'
+import { denormalizePagePath } from '../../../../shared/lib/page-path/denormalize-page-path'
 import cookie from 'next/dist/compiled/cookie'
 import { TEMPORARY_REDIRECT_STATUS } from '../../../../shared/lib/constants'
 import { addRequestMeta } from '../../../../server/request-meta'
diff --git a/packages/next/export/index.ts b/packages/next/export/index.ts
index ddeda3b155e81..8191dd75e7f34 100644
--- a/packages/next/export/index.ts
+++ b/packages/next/export/index.ts
@@ -34,10 +34,8 @@ import { NextConfigComplete } from '../server/config-shared'
 import { eventCliSession } from '../telemetry/events'
 import { hasNextSupport } from '../telemetry/ci-info'
 import { Telemetry } from '../telemetry/storage'
-import {
-  normalizePagePath,
-  denormalizePagePath,
-} from '../server/page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
 import { loadEnvConfig } from '@next/env'
 import { PrerenderManifest } from '../build'
 import { PagesManifest } from '../build/webpack/plugins/pages-manifest-plugin'
diff --git a/packages/next/export/worker.ts b/packages/next/export/worker.ts
index 83d4181e1964a..e68d20456d088 100644
--- a/packages/next/export/worker.ts
+++ b/packages/next/export/worker.ts
@@ -13,7 +13,7 @@ import { loadComponents } from '../server/load-components'
 import { isDynamicRoute } from '../shared/lib/router/utils/is-dynamic'
 import { getRouteMatcher } from '../shared/lib/router/utils/route-matcher'
 import { getRouteRegex } from '../shared/lib/router/utils/route-regex'
-import { normalizePagePath } from '../server/page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 import { SERVER_PROPS_EXPORT_ERROR } from '../lib/constants'
 import '../server/node-polyfill-fetch'
 import { requireFontManifest } from '../server/require'
diff --git a/packages/next/server/base-server.ts b/packages/next/server/base-server.ts
index 9af94b082f63e..f47d30f94a0c8 100644
--- a/packages/next/server/base-server.ts
+++ b/packages/next/server/base-server.ts
@@ -50,7 +50,7 @@ import { isBlockedPage, isBot } from './utils'
 import RenderResult from './render-result'
 import { removePathTrailingSlash } from '../client/normalize-trailing-slash'
 import getRouteFromAssetPath from '../shared/lib/router/utils/get-route-from-asset-path'
-import { denormalizePagePath } from './page-path-utils'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
 import { normalizeLocalePath } from '../shared/lib/i18n/normalize-locale-path'
 import * as Log from '../build/output/log'
 import { detectDomainLocale } from '../shared/lib/i18n/detect-domain-locale'
diff --git a/packages/next/server/dev/hot-reloader.ts b/packages/next/server/dev/hot-reloader.ts
index 798920d3e4317..d17049d479664 100644
--- a/packages/next/server/dev/hot-reloader.ts
+++ b/packages/next/server/dev/hot-reloader.ts
@@ -26,7 +26,8 @@ import {
   entries,
   onDemandEntryHandler,
 } from './on-demand-entry-handler'
-import { denormalizePagePath, normalizePathSep } from '../page-path-utils'
+import { denormalizePagePath } from '../../shared/lib/page-path/denormalize-page-path'
+import { normalizePathSep } from '../../shared/lib/page-path/normalize-path-sep'
 import getRouteFromEntrypoint from '../get-route-from-entrypoint'
 import { fileExists } from '../../lib/file-exists'
 import { difference } from '../../build/utils'
diff --git a/packages/next/server/dev/next-dev-server.ts b/packages/next/server/dev/next-dev-server.ts
index 61462cf9dd98c..d23353c1ceeef 100644
--- a/packages/next/server/dev/next-dev-server.ts
+++ b/packages/next/server/dev/next-dev-server.ts
@@ -40,7 +40,8 @@ import {
   isDynamicRoute,
 } from '../../shared/lib/router/utils'
 import Server, { WrappedBuildError } from '../next-server'
-import { absolutePathToPage, normalizePagePath } from '../page-path-utils'
+import { normalizePagePath } from '../../shared/lib/page-path/normalize-page-path'
+import { absolutePathToPage } from '../../shared/lib/page-path/absolute-path-to-page'
 import Router from '../router'
 import { getPathMatch } from '../../shared/lib/router/utils/path-match'
 import { hasBasePath, replaceBasePath } from '../router-utils'
diff --git a/packages/next/server/dev/on-demand-entry-handler.ts b/packages/next/server/dev/on-demand-entry-handler.ts
index ef7c8cbf141d0..08eabdff3a532 100644
--- a/packages/next/server/dev/on-demand-entry-handler.ts
+++ b/packages/next/server/dev/on-demand-entry-handler.ts
@@ -5,8 +5,10 @@ import { EventEmitter } from 'events'
 import { findPageFile } from '../lib/find-page-file'
 import { getPageRuntime, runDependingOnPageType } from '../../build/entries'
 import { join, posix } from 'path'
-import { normalizePagePath, normalizePathSep } from '../page-path-utils'
-import { ensureLeadingSlash, removePagePathTail } from '../page-path-utils'
+import { normalizePathSep } from '../../shared/lib/page-path/normalize-path-sep'
+import { normalizePagePath } from '../../shared/lib/page-path/normalize-page-path'
+import { ensureLeadingSlash } from '../../shared/lib/page-path/ensure-leading-slash'
+import { removePagePathTail } from '../../shared/lib/page-path/remove-page-path-tail'
 import { pageNotFoundError } from '../require'
 import { reportTrigger } from '../../build/output'
 import getRouteFromEntrypoint from '../get-route-from-entrypoint'
diff --git a/packages/next/server/get-page-files.ts b/packages/next/server/get-page-files.ts
index 9a099951b9c9f..5e6945cbdf53b 100644
--- a/packages/next/server/get-page-files.ts
+++ b/packages/next/server/get-page-files.ts
@@ -1,4 +1,5 @@
-import { normalizePagePath, denormalizePagePath } from './page-path-utils'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 
 export type BuildManifest = {
   devFiles: readonly string[]
diff --git a/packages/next/server/incremental-cache.ts b/packages/next/server/incremental-cache.ts
index 109572a3e98cc..bb309aed2a11b 100644
--- a/packages/next/server/incremental-cache.ts
+++ b/packages/next/server/incremental-cache.ts
@@ -3,7 +3,7 @@ import type { CacheFs } from '../shared/lib/utils'
 import LRUCache from 'next/dist/compiled/lru-cache'
 import path from '../shared/lib/isomorphic/path'
 import { PrerenderManifest } from '../build'
-import { normalizePagePath } from './page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 import { IncrementalCacheValue, IncrementalCacheEntry } from './response-cache'
 
 function toRoute(pathname: string): string {
diff --git a/packages/next/server/lib/find-page-file.ts b/packages/next/server/lib/find-page-file.ts
index aeab2d1653d18..b7e60c2b7dd56 100644
--- a/packages/next/server/lib/find-page-file.ts
+++ b/packages/next/server/lib/find-page-file.ts
@@ -1,5 +1,5 @@
 import { fileExists } from '../../lib/file-exists'
-import { getPagePaths } from '../page-path-utils'
+import { getPagePaths } from '../../shared/lib/page-path/get-page-paths'
 import { nonNullable } from '../../lib/non-nullable'
 import { join, sep, normalize } from 'path'
 import { promises } from 'fs'
diff --git a/packages/next/server/next-server.ts b/packages/next/server/next-server.ts
index 2cef57c694376..c0a5e91ccef76 100644
--- a/packages/next/server/next-server.ts
+++ b/packages/next/server/next-server.ts
@@ -55,7 +55,7 @@ import BaseServer, {
   stringifyQuery,
 } from './base-server'
 import { getMiddlewareInfo, getPagePath, requireFontManifest } from './require'
-import { normalizePagePath } from './page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
 import { loadComponents } from './load-components'
 import isError, { getProperError } from '../lib/is-error'
 import { FontManifest } from './font-utils'
diff --git a/packages/next/server/page-path-utils.ts b/packages/next/server/page-path-utils.ts
deleted file mode 100644
index e41a3476faf3d..0000000000000
--- a/packages/next/server/page-path-utils.ts
+++ /dev/null
@@ -1,123 +0,0 @@
-import { isDynamicRoute } from '../shared/lib/router/utils'
-import { join, posix, relative } from '../shared/lib/isomorphic/path'
-import { flatten } from '../shared/lib/flatten'
-
-/**
- * For a given page path, this function ensures that there is a leading slash.
- * If there is not a leading slash, one is added, otherwise it is noop.
- */
-export function ensureLeadingSlash(path: string) {
-  return path.startsWith('/') ? path : `/${path}`
-}
-
-/**
- * For a given page path, this function ensures that there is no backslash
- * escaping slashes in the path. Example:
- *  - `foo\/bar\/baz` -> `foo/bar/baz`
- */
-export function normalizePathSep(path: string): string {
-  return path.replace(/\\/g, '/')
-}
-
-/**
- * Removes the file extension for a page and the trailing `index` if it exists
- * making sure to not return an empty string. The page head is not touched
- * and returned as it is passed. Examples:
- *   - `/foo/bar/baz/index.js` -> `/foo/bar/baz`
- *   - `/foo/bar/baz.js` -> `/foo/bar/baz`
- *
- * @param pagePath A page to a page file (absolute or relative)
- * @param extensions Extensions allowed for the page.
- */
-export function removePagePathTail(pagePath: string, extensions: string[]) {
-  return (
-    normalizePathSep(pagePath)
-      .replace(new RegExp(`\\.+(?:${extensions.join('|')})$`), '')
-      .replace(/\/index$/, '') || '/'
-  )
-}
-
-/**
- * Takes a page and transforms it into its file counterpart ensuring that the
- * output is normalized. Note this function is not idempotent because a page
- * `/index` can be referencing `/index/index.js` and `/index/index` could be
- * referencing `/index/index/index.js`. Examples:
- *  - `/` -> `/index`
- *  - `/index/foo` -> `/index/index/foo`
- *  - `/index` -> `/index/index`
- */
-export function normalizePagePath(page: string): string {
-  const normalized = ensureLeadingSlash(
-    /^\/index(\/|$)/.test(page) && !isDynamicRoute(page)
-      ? `/index${page}`
-      : page === '/'
-      ? '/index'
-      : page
-  )
-
-  const resolvedPage = posix.normalize(normalized)
-  if (resolvedPage !== normalized) {
-    throw new Error(
-      `Requested and resolved page mismatch: ${normalized} ${resolvedPage}`
-    )
-  }
-
-  return normalized
-}
-
-/**
- * Performs the opposite transformation of `normalizePagePath`. Note that
- * this function is not idempotent either in cases where there are multiple
- * leading `/index` for the page. Examples:
- *  - `/index` -> `/`
- *  - `/index/foo` -> `/foo`
- *  - `/index/index` -> `/index`
- */
-export function denormalizePagePath(page: string) {
-  let _page = normalizePathSep(page)
-  return _page.startsWith('/index/') && !isDynamicRoute(_page)
-    ? _page.slice(6)
-    : _page !== '/index'
-    ? _page
-    : '/'
-}
-
-/**
- * Calculate all possible pagePaths for a given normalized pagePath along with
- * allowed extensions. This can be used to check which one of the files exists
- * and to debug inspected locations.
- *
- * @param normalizedPagePath Normalized page path (it will denormalize).
- * @param extensions Allowed extensions.
- */
-export function getPagePaths(normalizedPagePath: string, extensions: string[]) {
-  const page = denormalizePagePath(normalizedPagePath)
-  return flatten(
-    extensions.map((extension) => {
-      return !normalizedPagePath.endsWith('/index')
-        ? [`${page}.${extension}`, join(page, `index.${extension}`)]
-        : [join(page, `index.${extension}`)]
-    })
-  )
-}
-
-/**
- * Given the absolute path to the pages folder, an absolute file path for a
- * page and the page extensions, this function will return the page path
- * relative to the pages folder. It doesn't consider index tail. Example:
- *  - `/Users/rick/my-project/pages/foo/bar/baz.js` -> `/foo/bar/baz`
- *
- * @param pagesDir Absolute path to the pages folder.
- * @param filepath Absolute path to the page.
- * @param extensions Extensions allowed for the page.
- */
-export function absolutePathToPage(
-  pagesDir: string,
-  pagePath: string,
-  extensions: string[]
-) {
-  return removePagePathTail(
-    normalizePathSep(ensureLeadingSlash(relative(pagesDir, pagePath))),
-    extensions
-  )
-}
diff --git a/packages/next/server/render.tsx b/packages/next/server/render.tsx
index 12d481ddaaac4..cd3af5d6d4fdb 100644
--- a/packages/next/server/render.tsx
+++ b/packages/next/server/render.tsx
@@ -55,7 +55,8 @@ import {
   loadGetInitialProps,
 } from '../shared/lib/utils'
 import { HtmlContext } from '../shared/lib/html-context'
-import { normalizePagePath, denormalizePagePath } from './page-path-utils'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
 import { getRequestMeta, NextParsedUrlQuery } from './request-meta'
 import {
   allowedStatusCodes,
diff --git a/packages/next/server/require.ts b/packages/next/server/require.ts
index ce3169afb7da3..ee436ab9b64e9 100644
--- a/packages/next/server/require.ts
+++ b/packages/next/server/require.ts
@@ -7,8 +7,9 @@ import {
   SERVER_DIRECTORY,
   SERVERLESS_DIRECTORY,
 } from '../shared/lib/constants'
-import { normalizePagePath, denormalizePagePath } from './page-path-utils'
 import { normalizeLocalePath } from '../shared/lib/i18n/normalize-locale-path'
+import { normalizePagePath } from '../shared/lib/page-path/normalize-page-path'
+import { denormalizePagePath } from '../shared/lib/page-path/denormalize-page-path'
 import type { PagesManifest } from '../build/webpack/plugins/pages-manifest-plugin'
 import type { MiddlewareManifest } from '../build/webpack/plugins/middleware-plugin'
 import type { WasmBinding } from '../build/webpack/loaders/get-module-build-info'
diff --git a/packages/next/shared/lib/i18n/get-locale-metadata.ts b/packages/next/shared/lib/i18n/get-locale-metadata.ts
index 3847a35edd273..f62273bd6758a 100644
--- a/packages/next/shared/lib/i18n/get-locale-metadata.ts
+++ b/packages/next/shared/lib/i18n/get-locale-metadata.ts
@@ -1,5 +1,5 @@
 import { acceptLanguage } from '../../../server/accept-header'
-import { denormalizePagePath } from '../../../server/page-path-utils'
+import { denormalizePagePath } from '../page-path/denormalize-page-path'
 import { detectDomainLocale } from './detect-domain-locale'
 import { formatUrl } from '../router/utils/format-url'
 import { normalizeLocalePath } from './normalize-locale-path'
diff --git a/packages/next/shared/lib/page-path/absolute-path-to-page.ts b/packages/next/shared/lib/page-path/absolute-path-to-page.ts
new file mode 100644
index 0000000000000..6b2cd91a6e3df
--- /dev/null
+++ b/packages/next/shared/lib/page-path/absolute-path-to-page.ts
@@ -0,0 +1,25 @@
+import { ensureLeadingSlash } from './ensure-leading-slash'
+import { normalizePathSep } from './normalize-path-sep'
+import { relative } from '../isomorphic/path'
+import { removePagePathTail } from './remove-page-path-tail'
+
+/**
+ * Given the absolute path to the pages folder, an absolute file path for a
+ * page and the page extensions, this function will return the page path
+ * relative to the pages folder. It doesn't consider index tail. Example:
+ *  - `/Users/rick/my-project/pages/foo/bar/baz.js` -> `/foo/bar/baz`
+ *
+ * @param pagesDir Absolute path to the pages folder.
+ * @param filepath Absolute path to the page.
+ * @param extensions Extensions allowed for the page.
+ */
+export function absolutePathToPage(
+  pagesDir: string,
+  pagePath: string,
+  extensions: string[]
+) {
+  return removePagePathTail(
+    normalizePathSep(ensureLeadingSlash(relative(pagesDir, pagePath))),
+    extensions
+  )
+}
diff --git a/packages/next/shared/lib/page-path/denormalize-page-path.ts b/packages/next/shared/lib/page-path/denormalize-page-path.ts
new file mode 100644
index 0000000000000..adbc2ad8c44ae
--- /dev/null
+++ b/packages/next/shared/lib/page-path/denormalize-page-path.ts
@@ -0,0 +1,19 @@
+import { isDynamicRoute } from '../router/utils'
+import { normalizePathSep } from './normalize-path-sep'
+
+/**
+ * Performs the opposite transformation of `normalizePagePath`. Note that
+ * this function is not idempotent either in cases where there are multiple
+ * leading `/index` for the page. Examples:
+ *  - `/index` -> `/`
+ *  - `/index/foo` -> `/foo`
+ *  - `/index/index` -> `/index`
+ */
+export function denormalizePagePath(page: string) {
+  let _page = normalizePathSep(page)
+  return _page.startsWith('/index/') && !isDynamicRoute(_page)
+    ? _page.slice(6)
+    : _page !== '/index'
+    ? _page
+    : '/'
+}
diff --git a/packages/next/shared/lib/page-path/ensure-leading-slash.ts b/packages/next/shared/lib/page-path/ensure-leading-slash.ts
new file mode 100644
index 0000000000000..d23a6d30e84dc
--- /dev/null
+++ b/packages/next/shared/lib/page-path/ensure-leading-slash.ts
@@ -0,0 +1,7 @@
+/**
+ * For a given page path, this function ensures that there is a leading slash.
+ * If there is not a leading slash, one is added, otherwise it is noop.
+ */
+export function ensureLeadingSlash(path: string) {
+  return path.startsWith('/') ? path : `/${path}`
+}
diff --git a/packages/next/shared/lib/page-path/get-page-paths.ts b/packages/next/shared/lib/page-path/get-page-paths.ts
new file mode 100644
index 0000000000000..bdf9db2124202
--- /dev/null
+++ b/packages/next/shared/lib/page-path/get-page-paths.ts
@@ -0,0 +1,22 @@
+import { denormalizePagePath } from './denormalize-page-path'
+import { flatten } from '../flatten'
+import { join } from '../isomorphic/path'
+
+/**
+ * Calculate all possible pagePaths for a given normalized pagePath along with
+ * allowed extensions. This can be used to check which one of the files exists
+ * and to debug inspected locations.
+ *
+ * @param normalizedPagePath Normalized page path (it will denormalize).
+ * @param extensions Allowed extensions.
+ */
+export function getPagePaths(normalizedPagePath: string, extensions: string[]) {
+  const page = denormalizePagePath(normalizedPagePath)
+  return flatten(
+    extensions.map((extension) => {
+      return !normalizedPagePath.endsWith('/index')
+        ? [`${page}.${extension}`, join(page, `index.${extension}`)]
+        : [join(page, `index.${extension}`)]
+    })
+  )
+}
diff --git a/packages/next/shared/lib/page-path/normalize-page-path.ts b/packages/next/shared/lib/page-path/normalize-page-path.ts
new file mode 100644
index 0000000000000..1df8cef5856ad
--- /dev/null
+++ b/packages/next/shared/lib/page-path/normalize-page-path.ts
@@ -0,0 +1,31 @@
+import { ensureLeadingSlash } from './ensure-leading-slash'
+import { isDynamicRoute } from '../router/utils'
+import { posix } from '../isomorphic/path'
+
+/**
+ * Takes a page and transforms it into its file counterpart ensuring that the
+ * output is normalized. Note this function is not idempotent because a page
+ * `/index` can be referencing `/index/index.js` and `/index/index` could be
+ * referencing `/index/index/index.js`. Examples:
+ *  - `/` -> `/index`
+ *  - `/index/foo` -> `/index/index/foo`
+ *  - `/index` -> `/index/index`
+ */
+export function normalizePagePath(page: string): string {
+  const normalized = ensureLeadingSlash(
+    /^\/index(\/|$)/.test(page) && !isDynamicRoute(page)
+      ? `/index${page}`
+      : page === '/'
+      ? '/index'
+      : page
+  )
+
+  const resolvedPage = posix.normalize(normalized)
+  if (resolvedPage !== normalized) {
+    throw new Error(
+      `Requested and resolved page mismatch: ${normalized} ${resolvedPage}`
+    )
+  }
+
+  return normalized
+}
diff --git a/packages/next/shared/lib/page-path/normalize-path-sep.ts b/packages/next/shared/lib/page-path/normalize-path-sep.ts
new file mode 100644
index 0000000000000..a3df0473e4528
--- /dev/null
+++ b/packages/next/shared/lib/page-path/normalize-path-sep.ts
@@ -0,0 +1,8 @@
+/**
+ * For a given page path, this function ensures that there is no backslash
+ * escaping slashes in the path. Example:
+ *  - `foo\/bar\/baz` -> `foo/bar/baz`
+ */
+export function normalizePathSep(path: string): string {
+  return path.replace(/\\/g, '/')
+}
diff --git a/packages/next/shared/lib/page-path/remove-page-path-tail.ts b/packages/next/shared/lib/page-path/remove-page-path-tail.ts
new file mode 100644
index 0000000000000..3b0d94df46a19
--- /dev/null
+++ b/packages/next/shared/lib/page-path/remove-page-path-tail.ts
@@ -0,0 +1,19 @@
+import { normalizePathSep } from './normalize-path-sep'
+
+/**
+ * Removes the file extension for a page and the trailing `index` if it exists
+ * making sure to not return an empty string. The page head is not touched
+ * and returned as it is passed. Examples:
+ *   - `/foo/bar/baz/index.js` -> `/foo/bar/baz`
+ *   - `/foo/bar/baz.js` -> `/foo/bar/baz`
+ *
+ * @param pagePath A page to a page file (absolute or relative)
+ * @param extensions Extensions allowed for the page.
+ */
+export function removePagePathTail(pagePath: string, extensions: string[]) {
+  return (
+    normalizePathSep(pagePath)
+      .replace(new RegExp(`\\.+(?:${extensions.join('|')})$`), '')
+      .replace(/\/index$/, '') || '/'
+  )
+}
diff --git a/packages/next/shared/lib/router/router.ts b/packages/next/shared/lib/router/router.ts
index 316c4408eae12..d36d38a9ff64d 100644
--- a/packages/next/shared/lib/router/router.ts
+++ b/packages/next/shared/lib/router/router.ts
@@ -18,7 +18,7 @@ import {
 } from '../../../client/route-loader'
 import { handleClientScriptLoad } from '../../../client/script'
 import isError, { getProperError } from '../../../lib/is-error'
-import { denormalizePagePath } from '../../../server/page-path-utils'
+import { denormalizePagePath } from '../page-path/denormalize-page-path'
 import { normalizeLocalePath } from '../i18n/normalize-locale-path'
 import mitt from '../mitt'
 import {
diff --git a/test/integration/production-swcminify/test/index.test.js b/test/integration/production-swcminify/test/index.test.js
index 348394d03181a..cd4697912c1cb 100644
--- a/test/integration/production-swcminify/test/index.test.js
+++ b/test/integration/production-swcminify/test/index.test.js
@@ -75,12 +75,12 @@ describe.skip('Production Usage with swcMinify', () => {
     expect(serverTrace.version).toBe(1)
     expect(
       serverTrace.files.some((file) =>
-        file.includes('next/dist/server/send-payload/index.js')
+        file.includes('next/dist/shared/lib/page-path/normalize-page-path.js')
       )
     ).toBe(true)
     expect(
       serverTrace.files.some((file) =>
-        file.includes('next/dist/server/page-path-utils.js')
+        file.includes('next/dist/shared/lib/page-path/normalize-page-path.js')
       )
     ).toBe(true)
     expect(
diff --git a/test/integration/production/test/index.test.js b/test/integration/production/test/index.test.js
index e74639e042889..33029d2b957de 100644
--- a/test/integration/production/test/index.test.js
+++ b/test/integration/production/test/index.test.js
@@ -105,7 +105,7 @@ describe('Production Usage', () => {
     ).toBe(true)
     expect(
       serverTrace.files.some((file) =>
-        file.includes('next/dist/server/page-path-utils.js')
+        file.includes('next/dist/shared/lib/page-path/normalize-page-path.js')
       )
     ).toBe(true)
     expect(
diff --git a/test/unit/find-page-file.test.ts b/test/unit/find-page-file.test.ts
index b51b39055bbc6..1b468854fe109 100644
--- a/test/unit/find-page-file.test.ts
+++ b/test/unit/find-page-file.test.ts
@@ -1,6 +1,6 @@
 /* eslint-env jest */
 import { findPageFile } from 'next/dist/server/lib/find-page-file'
-import { normalizePagePath } from 'next/dist/server/page-path-utils'
+import { normalizePagePath } from 'packages/next/dist/shared/lib/page-path/normalize-page-path'
 
 import { join } from 'path'
 
diff --git a/test/unit/isolated/require-page.test.ts b/test/unit/isolated/require-page.test.ts
index 11b0cac9b8a2c..9bb314c25dc67 100644
--- a/test/unit/isolated/require-page.test.ts
+++ b/test/unit/isolated/require-page.test.ts
@@ -1,8 +1,8 @@
 /* eslint-env jest */
 
 import { join } from 'path'
-import { normalizePagePath } from 'next/dist/server/page-path-utils'
 import { SERVER_DIRECTORY, CLIENT_STATIC_FILES_PATH } from 'next/constants'
+import { normalizePagePath } from 'next/dist/shared/lib/page-path/normalize-page-path'
 import {
   requirePage,
   getPagePath,